In this paper, two simple yet efficient embedded block-based image compression algorithms are presented. These algorithms not only improve the rate distortion performances of set partitioning in hierarchical trees (SP...
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In this paper, two simple yet efficient embedded block-based image compression algorithms are presented. These algorithms not only improve the rate distortion performances of set partitioning in hierarchical trees (SPIHT) and set partitioning in embedded block coder (SPECK) at lower bit rates but also reduces the dynamic memory requirement by 91.1% in comparison to SPIHT. The former objective is achieved by better exploiting the coefficient decaying spectrum of the wavelet transformd images and the later objective is realised by improved listless implementation of the algorithms. The proposed algorithms explicitly perform breadth first search like SPECK. Extensive simulation conducted on various standard grayscale and color images indicate significant peak-signal-to-noise-ratio (PSNR) improvement over most of the state-of-the-art wavelet-based embedded coders including JPEG2000 at lower rates. The reduction of encoding and decoding time as well as improvement in coding efficiency at lower bit rates facilitate these coder as better candidates for multimedia applications.
This paper presents a listless variant of modified wavelet block tree coding (MLBTC) algorithm. Wavelet block-tree coding (WBTC) improves the image compression performance of set partitioning in hierarchical trees (SP...
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This paper presents a listless variant of modified wavelet block tree coding (MLBTC) algorithm. Wavelet block-tree coding (WBTC) improves the image compression performance of set partitioning in hierarchical trees (SPIHT) at lower rates by efficiently encoding both inter- and intra-scale correlations. The use of auxiliary lists makes WBTC undesirable for hardware implementation as it needs a lot of memory management due to exponential increase of nodes on each pass. The proposed coder named as hierarchical listless block-tree DTT (HLBT DTT) that combines discrete Tchebichef transform (DTT) with MLBTC exhibits compression performance significantly higher than most of the DCT-based embedded coders and comparable with JPEG 2000, especially at lower bit rates. Further, HLBT DTT requires only 10% of memory than that of DCT-based SPIHT/WBTC coders.
We developed knob operated shift control strategy used on pure electric vehicles by use of Matlab 2015 b and its embedded coder(EC) toolbox based on the V-model development process. Firstly, the functional requirement...
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We developed knob operated shift control strategy used on pure electric vehicles by use of Matlab 2015 b and its embedded coder(EC) toolbox based on the V-model development process. Firstly, the functional requirements of knob operated shift strategy were analyzed, a simulation system based on finite-state machine was established in Simulink/Stateflow, the input and output signals, and the parameters of the model were scaled. Secondly, C code were automatic generated by use of EC toolbox, test cases were compiled with Excel, model in loop(MIL) and software in loop(SIL) auto test tool were used and the model was tested and modified. Test results indicate that, under different conditions, the dynamic response of knob operated shift function meet the design requirements.
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